Introduction
Pre-req guide on removing the main flex cables from the Galaxy S20.
Tools
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            Apply a suction cup to the back of the phone, as close to the center of the bottom edge as possible. 
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            Pull on the suction cup with strong, steady force to create a gap between the back cover and the frame. 
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            Insert the point of an opening pick into the gap. 
 
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            Slide the pick back and forth along the bottom edge to slice through the adhesive. 
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            Leave your opening pick in the seam to prevent the adhesive from resealing. 
 
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            Apply a suction cup to the back of the phone, as close to the center of the left edge as possible. 
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            Pull on the suction cup with strong, steady force to create a gap between the back cover and the frame. 
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            Insert the point of an opening pick into the gap. 
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            You can try also applying a few drops of high concentration (over 90%) isopropyl alcohol into the seam to help loosen the adhesive. 
 
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            Once the pick is underneath the glass's edge, tilt it downward and insert it further to fully separate the back cover's adhesive. 
 
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            Slide the pick all along the left edge of the phone to separate the back cover's adhesive. 
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            Leave your pick under the left edge of the glass near the top left corner to prevent the adhesive from resealing. 
 
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            Apply a suction cup to the back of the phone, as close to the center of the right edge as possible. 
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            Pull on the suction cup with strong, steady force to create a gap between the back cover and the frame. 
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            Insert the point of an opening pick into the gap. 
 
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            Slide the pick all along the right edge of the phone to separate the back cover's adhesive. 
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            Leave your pick under the right edge of the glass near the top of the device to prevent the adhesive from resealing. 
 
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            Gradually slide the pick from the right edge of the device around the top right corner. 
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            Continue slicing along the top edge all the way to the top left corner to fully separate the back cover adhesive. 
 
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            Lift the back cover slowly. Use opening picks to slice any remaining adhesive. 
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            Remove the back cover. 
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            This is a good point to power on your phone and test all functions before sealing it up. Be sure to power your phone back down completely before you continue working. 
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            Remove any adhesive chunks with a pair of tweezers or your fingers. Apply heat if you're having trouble separating the adhesive. 
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            If you're using custom-cut adhesives, follow this guide. 
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            If you're using double-sided tape, follow this guide. 
 
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            Use a Phillips #00 screwdriver to remove the five 4 mm-long screws securing the motherboard bracket. 
 
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            Gently peel the wireless charging coil away from the device. 
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            Remove the wireless charging coil. 
 
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            Use a Phillips #00 screwdriver to remove the five 4 mm-long screws securing the loudspeaker and lower midframe. 
 
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            Use a spudger to pry up and disconnect the main and auxiliary flex cables from the daughterboard near the bottom of the device. 
 
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            Use a spudger to pry up and disconnect the main and auxiliary flex cables from the motherboard. 
 
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To reassemble your device, follow these instructions in reverse order.
Found that using the iOpener did not provide enough heat to weaken the adhesive, went with a hairdryer instead. Make sure to never keep the hairdryer still, and apply heat on high for 30 seconds to 1 minute per side did the job for me. iOpener just did not get hot enough
Phil R -